DESY beam test preparations Paul Dauncey 26 Jan 2010 Paul Dauncey 1
Two main goals for beam test • MIP paper • Find efficiency for other sensor variants which were not covered in enough detail at CERN • Requires that enough sensor variants are available and trimmed • Aim for two each of 12 mm non-deep P-well, 12 mm hi-res and 18 mm hires, plus as many as possible (at least five) of standard sensors • All need to be trimmed, potted and checked beforehand • Shower density paper • Measure electron shower response and core density • Requires accurate knowledge of shower centre • Need external tracking to find projected impact point • Use EUDET telescope and combine with TPAC DAQ data 26 Jan 2010 Paul Dauncey 2
Telescope interface • EUDET trigger handed by TLU • Designed by Dave Cussans, Bristol • Can send (lowest 15 bits of) trigger number for each trigger via hardware interface; need RJ 45 cable to connect to TLU • Add interface to master USB_DAQ firmware • Rui Gao, Oxford, has started working on this • Will make a custom RJ 45 -IDC short cable to plug into USB_DAQ • Record trigger arrival timestamps and trigger numbers in FPGA • Also need run number; accessible through EUDET socket software • Read out run/trigger data along with other data following bunch train • Associate systems offline • Use standard EUDET software to internally align telescope and form tracks (as being done by Alessandro Calderone at Bristol) • Use run/trigger data and timestamps to associate tracks with one (or a few) BX in TPAC data • Do alignment by comparing TPAC hits to tracks; new code needed 26 Jan 2010 Paul Dauncey 3
Suggested stack geometry • Put tungsten slabs within sensor array, not in front • Still allows several layers behind tungsten • Could be three before/three behind rather than two/four • Initial layers give direct cross-check of telescope and make alignment easier • Also give backup in case telescope data cannot be interpreted • Initial layers allow “MIP” measurements to continue even while doing shower measurements 26 Jan 2010 Paul Dauncey 4
Triggering • What does EUDET telescope trigger use for triggering? • TPAC 1× 1 cm 2 scintillators or some other, larger ones? • Do we need to know about showers just outside the scintillators? • These would give tails which would look like random noise • Makes comparison with out-of-time BXs more complicated • Larger scintillators, e. g. 5× 5 cm 2, would catch these tails • Downsides to using larger scintillators • Higher rate of telescope triggers so more deadtime; probably not a big issue • Need to buy/borrow and commission them! 26 Jan 2010 Paul Dauncey 5
Plan • Reassemble system as used at CERN • Start running with any/all sensors which are trimmed as they become available • System should be assembled asap – Marcel, Jan • Sensor gluing, potting and trimming – Jamie, Paul • Try out stack geometries with sensors both sides of tungsten • Find out what is feasible/easy • Do as soon as system is stable – Marcel, Jan • Add in new TPAC master firmware and TLU when Rui is ready • Get EUDET online software interface running also • Check run/trigger data look sensible offline • Aim for ~two weeks – Rui, Paul • Get larger scintillators for telescope trigger • Need HV and logic also • Ideally ready when interface is ready – John, Nigel? 26 Jan 2010 Paul Dauncey 6
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